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SMS4EncryptCBC_CS

Encrypts plaintext in the CBC ciphertext stealing mode of the SMS4 block cipher.

Syntax

IppStatus ippsSMS4EncryptCBC_CS1(const Ipp8u* pSrc, Ipp8u* pDst, int len, const IppsSMS4Spec* pCtx, const Ipp8u* pIV);

IppStatus ippsSMS4EncryptCBC_CS2(const Ipp8u* pSrc, Ipp8u* pDst, int len, const IppsSMS4Spec* pCtx, const Ipp8u* pIV);

IppStatus ippsSMS4EncryptCBC_CS3(const Ipp8u* pSrc, Ipp8u* pDst, int len, const IppsSMS4Spec* pCtx, const Ipp8u* pIV);

Include Files

ippcp.h

Parameters

pSrc

Pointer to the input plaintext data of variable length.

pDst

Pointer to the resulting ciphertext data.

len

Length of the input data stream in bytes.

pCtx

Pointer to the IppsSMS4Spec context.

pIV

Pointer to the initialization vector for the CBC mode operation.

Description

These functions encrypt the input data stream according to the three variants of the Cipher Block Chaining (CBC) mode with Ciphertext Stealing (CS), as specified in [NIST SP 800-38A A.]. An important difference of these variants from the CBC mode without CS is that the number of bits in the input plaintext does not have to be a multiple of the block size.

The block size is 128 bits in accordance with [SMS4].

Return Values

ippStsNoErr

Indicates no error. Any other value indicates an error or warning.

ippStsNullPtrErr

Indicates an error condition if any of the specified pointers is NULL.

ippStsLengthErr

  • For SMS4EncryptCBC_CS1 and SMS4EncryptCBC_CS2, indicates an error condition if the input data length is less than the cipher block size.

  • For SMS4EncryptCBC_CS3, indicates an error condition if the input data length is less than or equal to the cipher block size.

ippStsContextMatchErr

Indicates an error condition if the context parameter does not match the operation.

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